Pickling-bath.



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UNITED STATES PATENT OFFICE.

LAVERTY ADMINISTRATOR OF CEASED.

SAID CHARLES E. LAVERTY, DE-

' PlCKLING-BATH.

Specification of Letters Patent.

Patented June 11, 1907.

Application an August 22,1905. Serial Ho- 276,165

To all whom it may concern:

Be it known that 1, CHARLES E. Lavnn'rr, of Pittsburg, county of Allegheny, and State of Pennsylvania, have invented a new and useful 1m rovement in Pickling-Baths, of which the ollowing is a full, clear, and exact description.

My invention relates to the pickling of metal for the purpose of removing scale or oxid from its surface preparatory to further treatment such as coating the metal by galor t The object of my. invention is to provide a pickling-bath, by the use of which the time necessary to remove the scale or oxid from the surface of the metal treated is'greatly reduced, and in the use of which the scale or oxid is removed from the metal without appreciably attacking the surface of the metal.

- Another object of my invention is to provide a pickling-bath in the use of which, the weight of metal lost in pickl' from about 3 per cent., as is lost y the ordinary pickling solutions in use, to about & of 1 per cent.

My invention consists in the mixture of a hydrocarbon with the sulfuric acid ordinarily used in such pickling operations.

In the pre aration of the pickle in its pre ferred form, first add a h 'drocarbon to what is known as degree su 'c acid, the mate rials being mixed in a suitable vat. T a r slud e 'is the material-preferably used con- Fiififi the hg'edrocarbon, on account of its cheapness, it ing a waste product of the oil refining rocess, containing tar, oil and sulfuric acid althou h oil or other-forms of h drocarbons may used. I preferably a d the-sludge to the acid general y about lpart sludge to 15 parts acid by weight. This will give an excess of oil to the acid, the surplus oi] beinlg afterward skimmed from the too of thiilbat l h kr pre ar t e 1c ment, in ord eg to siive vs eight, it is made of much eater strength than is required for use an by its subsequent addition to water is reduced.-

solution for shiption when it is then skimmed off and the solution is ready for use. The mixture of acid and oil which is of much eater stren th 60 than required for use after e excess oil 18.8 been removed by skimming, is then added to a sulficient amount of water, until the solution has a specific gLrlavity of about 3 to 15 degrees Baum. W 'le addi the solution of acid and oil to the water, t e materials are thoroughly mixed by stirring or preferably by means of a steam and air jet introduced by a suitable pipe into'the mixing vat. v

The advantages of my invention lie in providing a pic bath, by the use of which, the time require for removing the scale from the surface of the metal treated is greatly reduced and in which the surface of the metal is not attacked by the acid in the bath to any 7 5 appreciable extent during the time required to remove the scale from the metal.

By the use of the improved pickling-bath, the amount of material required to subseguently coat the metal treated is greatly re- So uced, there being practically no decomposed metal on the surface of the pickled material, to be burned ofi and form dross and sal-ammoniac skimmings in the coating bath,

as is the case in the usual rocess. The 8 surface of the pickled material is finished smooth and in this way also the amount of coat material required is reduced.

Variations in thematerials used and in the pro ortions of the materials used may be ma e without departing from my invention.

Other than su furic acid may be used and materials other than oils containing hydrocarbon may be combined with the acid, since What I claim is b 1. A pickling-bath containing a hydrocaron. A

2. A pickling-bath containing an acid and 5 a. hydrocarbon.

3. A ickling-bath contalmng' sulfuric acid and wit ahydrocarbon.

4. A pickling bath containing an acid and a hydrocarbon oil.

5. A pic bath containing sulfuric acid and a. hydrocar on oil.

In testimony whereof, I have hereunto set my hand.

CHARLES E. LAVERTY. -Witnesses:

R. D. LITTLE, GEO. B. BLEMING. 

